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Oligotyping Reveals Community Level Habitat Selection Within the Genus Vibrio

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Oligotyping Reveals Community Level Habitat Selection Within the Genus Vibrio Oligotyping reveals community level habitat selection within the genus Vibrio Victor Schmidt, Julie Reveillaud, Erik Zettler, Tracy Mincer, Leslie Murphy, Linda Amaral-Zettler To cite this version: Victor Schmidt, Julie Reveillaud, Erik Zettler, Tracy Mincer, Leslie Murphy, et al.. Oligotyping reveals community level habitat selection within the genus Vibrio. Frontiers in Microbiology, Frontiers Media, 2014, 5 (563), pp.1-14. 10.3389/fmicb.2014.00563. hal-01104930 HAL Id: hal-01104930 https://hal.univ-brest.fr/hal-01104930 Submitted on 19 Jan 2015 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. ORIGINAL RESEARCH ARTICLE published: 13 November 2014 MICROBIOLOGY doi: 10.3389/fmicb.2014.00563 Oligotyping reveals community level habitat selection within the genus Vibrio Victor T. Schmidt 1,2, Julie Reveillaud 1†, Erik Zettler 3, Tracy J. Mincer 4, Leslie Murphy 1 and Linda A. Amaral-Zettler 1,5* 1 Marine Biological Laboratory, Josephine Bay Paul Center for Comparative Molecular Biology and Evolution, Woods Hole, MA, USA 2 Department of Ecology and Evolutionary Biology, Brown University, Providence, RI, USA 3 Sea Education Association, Woods Hole, MA, USA 4 Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, USA 5 Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI, USA Edited by: The genus Vibrio is a metabolically diverse group of facultative anaerobic bacteria, Rachel Susan Poretsky, University of common in aquatic environments and marine hosts. The genus contains several species Illinois at Chicago, USA of importance to human health and aquaculture, including the causative agents of human Reviewed by: cholera and fish vibriosis. Vibrios display a wide variety of known life histories, from Patrick K. H. Lee, City University of Hong Kong, China opportunistic pathogens to long-standing symbionts with individual host species. Studying Migun Shakya, Dartmouth College, Vibrio ecology has been challenging as individual species often display a wide range of USA habitat preferences, and groups of vibrios can act as socially cohesive groups. Although *Correspondence: strong associations with salinity, temperature and other environmental variables have been Linda A. Amaral-Zettler, Marine established, the degree of habitat or host specificity at both the individual and community Biological Laboratory, Josephine Bay Paul Center for Comparative levels is unknown. Here we use oligotyping analyses in combination with a large collection Molecular Biology and Evolution, of existing Vibrio 16S ribosomal RNA (rRNA) gene sequence data to reveal patterns 7 MBL St., Woods Hole, MA 02543, of Vibrio ecology across a wide range of environmental, host, and abiotic substrate USA associated habitats. Our data show that individual taxa often display a wide range of e-mail: [email protected] habitat preferences yet tend to be highly abundant in either substrate-associated or †Present address: Julie Reveillaud, UMR free-living environments. Our analyses show that Vibrio communities share considerable 6197-Laboratoire de Microbiologie overlap between two distinct hosts (i.e., sponge and fish), yet are distinct from the abiotic des Environnements Extrêmes plastic substrates. Lastly, evidence for habitat specificity at the community level exists (LM2E), Institut Universitaire in some habitats, despite considerable stochasticity in others. In addition to providing Européen de la Mer (IUEM), Université de Bretagne Occidentale, insights into Vibrio ecology across a broad range of habitats, our study shows the utility Plouzané, France; of oligotyping as a facile, high-throughput and unbiased method for large-scale analyses CNRS, UMR6197-Laboratoire de of publically available sequence data repositories and suggests its wide application could Microbiologie des Environnements Extrêmes (LM2E), Institut greatly extend the range of possibilities to explore microbial ecology. Universitaire Européen de la Mer Keywords: oligotyping, Vibrio ecology, host-microbe interactions, illumina sequencing, 16S rRNA analysis, (IUEM), Place Nicolas Copernic, plastisphere, aquaculture pathogens, meta-analysis Plouzané, France; Ifremer, Centre de Brest, REM/EEP/LM2E, ZI de la Pointe du Diable, CS 10070, Plouzané, France INTRODUCTION over 570 publicly available annotated genomes and over 64,000 Vibrio is a ubiquitous, speciose and commercially important 16S rRNA gene sequences annotated as vibrios in GenBank as bacterial genus with both host associated and free-living represen- of March 2014. Vibrio therefore represents an ideal candidate tatives. Several species within the genus are pathogenic to humans for applying new analytical approaches using pre-existing data to and animals. Vibrio cholerae has caused six historic and one ongo- gain further insights into the ecology of the genus. ing cholera pandemic, and countless epidemics (Mutreja et al., Making sense of Vibrio ecology has been a challenge, owing in 2011) including a recent outbreak in Haiti that killed more than part to its complex life history, its capacity to partition resources, 8000 people (Chin et al., 2011). Vibrio pathogens are also impor- and a strong propensity for lateral gene transfer between closely tant to the aquaculture industry, where they inflict costly losses related species (Hunt et al., 2008; Cordero et al., 2012). The com- on farmed fish, mollusks and shrimp (Austin and Austin, 2007), plexityofthegenusiswellillustratedbythediversityofitslife limiting the development of an industry poised to help bridge histories. On one hand, Vibrio has an average of 11 rRNA gene global food gaps and preserve wild fisheries (FAO, 2012). Due to copies, allowing for rapid growth rates under good conditions their importance to human and animal welfare, and the ease with (Heidelberg et al., 2000), suggestive of r-selected taxa, which can which they are cultured, vibrios are relatively well studied, with rapidly multiply given favorable conditions (Andrews and Harris, www.frontiersin.org November 2014 | Volume 5 | Article 563 | 1 Schmidt et al. Vibrio community structure across habitats 1986). Conversely, bioluminescent vibrios have formed symbiotic involved culturing isolates from target habitats and sequencing relationships with squid and anglerfish over evolutionary time multiple loci in order to gain sufficient taxonomic resolution scales (Ruby and Nealson, 1976), suggestive of a more stable K- within a sample, requiring the use of Vibrio-specific primers selected strategy. Some flexibility between r vs. K strategies may (Preheim et al., 2011a; Szabo et al., 2013), and making-large scale, even exist within fine scale taxonomic categories, as environmen- non-targeted, multi-habitat analyses challenging and costly. More tal conditions such as pH, concentrations of bile, bicarbonate recently, oligotyping rRNA gene amplicon sequences affords and nutrients may trigger rapid growth within a host in a for- extremely high resolution analysis of community structure by mally dormant environmental bacterium (Skorupski and Taylor, selecting a subset of highly informative nucleotide sites within 2013). To further complicate the ecology of individual Vibrio single loci of 16S rRNA gene hypervariable regions alone (Eren species, recent experiments indicate that disparate species can et al., 2013a, 2014; Reveillaud et al., 2014). At the same time, form socially cohesive groups, taking advantage of their propen- repositories of 16S rRNA gene sequences have grown in size and sity for exchanging genetic elements to confer greater antibiotic scope. The Visualization and Analysis of Microbial Population resistance among closely related strains, and to likely regulate Structures (VAMPS) database is one such repository that contains virulence (Cordero et al., 2012). over 1000 datasets representing hundred of millions of publically Vibrios also seem to be highly variable in habitat preference. available 16S rRNA gene sequences (Huse et al., 2014). Traditionally Vibrio life history has been studied in association The aim of the present study was to use oligotyping to explore with multicellular marine hosts, including fish, mollusks, and a the distribution of Vibrio communities in a range of substrate- wide range of zooplankton (Liston, 1956; Aiso et al., 1968), yet associated (both biotic and abiotic) and free-living aquatic envi- they can also exist in the ambient aquatic environment, associ- ronments. We used this method to test the hypothesis that distinct ated with plastic particles (Zettler et al., 2013), or phytoplankton Vibrio communities occur in different habitats, and are char- blooms (Gilbert et al., 2012). Whether individual Vibrio species, acterized by clear distinctions between host habitats and their or communities of vibrios, are specific to particular habitats is an surrounding water. open question, and distinguishing specialized associations from opportunistic colonization is challenging (Takemura et al., 2014). MATERIALS AND METHODS Host specificity has been observed
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